Improvement in squares



W. H. WALKER.

, v Square; No. 167,482. atentedSept.7,1875.

WITNESSES:

flmwmmmmy UNITED STATES PATENT Qrrron.

WILLIAM H. WALKER, OF CHARLESTON, SOUTH CAROLINA.

IMPROVEMENT IN SQUARES.

Specification forming part of Letteis Patent No. 167, 18 2, dated September 7, 1875 application filed October 17, 1874.

To all whom it may concern:

Be it known that 1, WILLIAM H. WALKER, of Charleston, in the county of Charleston and State of South Carolina, have invented a new and Improved Combined Rule and Square, of which the following is a specifica- 171011:

The invention will first be fully described, and then pointed out in the claim.

Figure l is a side elevation of my improved combined rule and square folded up for carrying in the pocket. Fig. 2 is a plan view of it in the same position 5 and Fig. 3 is an eleva' tion ofit when opened and adjusted for use.

Similar letters of reference indicate corresponding parts.

A represents the wood portions of the principal head. B represents the metal tongue; 0, metal braces, and D the auxiliary head of two metal pieces. The wood pieces of the head are now connected to the tongue by the bolts E, which move in slots F around the the axis G, whereat the auxiliary head D is pivoted to the tongue, and the parts thereof are pivoted together. At H the braces are pivoted to the auxiliary head, and the wood head is also fastened to them.

This-arrangement makes a more accurate instrument than when the two parts of the head are pivoted to the tongue separately. The head D is arranged in the groove of the principal head, into which the braces and the tongue fold. The connection of the braces with the tongue by a screw, I, with a binding thumb-nut, J, is the same as in the original instrument.

Having thus described my invention, I claim as new and desire to secure by Letters Patcut-"- The straps D D, made fast to case A at one end, pivoted at the other on pin G of the tongue B, and held to said tongue by pins E E traveling in the arc-slots F F, as and for the purpose specified.

W. H. WALKER. Witnesses:

R. R. HUGER, SENKLER Smous. 

